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1. OTU boards on WDM equipment, except OCU, transparently transmit SS bits without detection.
2. OCU boards process SS bits. The SS bit should be set to 10. When the SS bit is set to 00, 01, or 11, AU_AIS is inserted and services are interrupted. In this scenario, no alarm is reported on the board (because the AU_AIS alarm is not detected on the WDM side of the board.)
During a test, the Agilent OmniBer 817 meter is used to transmit STM-16 data. When the Payload option is Framed or Structed and the column in the overhead setup is set to ALL, you can change the H1 SS bit. When the SS bit is set to 00, 01, or 11, an AU_AIS, PDH, or LOF alarm is reported. When it is set to 10, no abnormality occurs.
This issue is related to the chip processing mode. OCU boards use the same chip and therefore have the issue.

Other related questions:

1. OTU boards on WDM equipment, except OCU, transparently transmit SS bits without detection.
2. OCU boards process SS bits. The SS bit should be set to 10. When the SS bit is set to 00, 01, or 11, AU_AIS is inserted and services are interrupted. In this scenario, no alarm is reported on the board (because the AU_AIS alarm is not detected on the WDM side of the board.)
During a test, the Agilent OmniBer 817 meter is used to transmit STM-16 data. When the Payload option is Framed or Structed and the column in the overhead setup is set to ALL, you can change the H1 SS bit. When the SS bit is set to 00, 01, or 11, an AU_AIS, PDH, or LOF alarm is reported. When it is set to 10, no abnormality occurs.
This issue is related to the chip processing mode. OCU boards use the same chip and therefore have the issue.

Reasons for pointer justification on an SDH line board:
The reason why pointer justification occurs on an SDH line board is that NE clocks are not synchronized. When the rate (frame rate) of VC-4 is higher than that of AU-4, a negative pointer justification occurs. When the rate of VC-4 is lower than that of AU-4, a positive pointer justification occurs.

1. During the system commissioning of devices in back-to-back mode, use pigtails to respectively connect the Rx and Tx ports of the TQX board on the front subrack to the Tx and Rx ports of the corresponding board on the rear subrack.
2. Connect the Rx and Tx ports of the TDX board in the rear subrack at the central site to form a loopback.
3. Connect test instruments to the TI and RO ports of the TDX board on another subrack at the central site to cover most of the paths after the 24-hour bit error test.
4. If another wavelength needs to be tested, connect multiple wavelengths according to the SDH connecting method.

The possible causes are as follows:
Possible cause 1: The line between the WDM equipment and the data equipment is faulty.
Possible cause 2: The client-side parameters of the interconnected boards on WDM products are incorrectly configured.
Possible cause 3: An interconnected board is faulty.